Application of the Gabor Transform for Analysis of Electromyographic Signals of the Intestine in the Low-Frequency Region

The Gabor transform allows quantitative estimation of the non-stationarity of the electromyographic signal in the low-frequency region with the maxim permissible time–frequency resolution. The calculation of the parameters of the Gabor transform was conducted on different time and frequency intervals to estimate the slow-wave activity of the intestine. It was demonstrated that the efficient size of the 32-s time window, which provides the efficient resolution of the frequency spectrum at 0.01 Hz, is suitable for the accurate study of the change in the frequency of slow waves. The ability to construct the dependence of the change in the frequency of slow waves of electromyograms on time with the specified accuracy was demonstrated.